Best if you want to: Use one essential tool to file, buff, smooth and shine your nails thanks to a four-way nail block with different finishes on each side. How it works: Four sides have steps 1-4 clearly printed on them for an easy-to-follow nail care regime. Side 1 is abrasive enough to help file nails into shape. Side 2 helps to smooth ridges and clean stains from nails. Side 3 buffs and smoothes nails. Side 4 adds a natural-looking sheen to nails....